$\int\:\:\frac{sec\:y\:tan\:y}{2+\:sec\:y\:}dy$

$\frac{d}{dx}x^2y^3=x^3y^2+4$

$\left(x-2y\right)\cdot dx+\left(2x+y\right)\cdot dy=0$

$2xy-8xy+10xy$

$\frac{\left(x+2\right)\left(x+1\right)}{x^3-1}$

$\lim_{x\to0}\left(\frac{sen^2\left(x\right)}{x-tan\left(x\right)}\right)$

$1.4x\:+\:-6.5x$